LEM click

LEM click carries the LTS 6-NP current transducer and MCP3201 ADC converter. The click can measure AC and DC current with exceptional speed, up to 200 KHz.

click Product page

Click library

• Author : Jovan Stajkovic
• Date : Dec 2019.
• Type : SPI type

Software Support

We provide a library for the Lem Click as well as a demo application (example), developed using MikroElektronika compilers. The demo can run on all the main MikroElektronika development boards.

Package can be downloaded/installed directly form compilers IDE(recommended way), or downloaded from our LibStock, or found on mikroE github account.

Library Description

This library contains API for Lem Click driver.

Standard key functions :

• Config Object Initialization function.

  void lem_cfg_setup ( lem_cfg_t *cfg );

• Initialization function.

  LEM_RETVAL lem_init ( lem_t ctx, lem_cfg_t cfg );

Example key functions :

• Function is used to read current in amperes or milliamperes.

  float lem_get_current ( lem_t *ctx, float coef );

Examples Description

Demo app measures and displays current by using LEM click board.

The demo application is composed of two sections :

Application Init

Initalizes SPI, LOG and click drivers.

void application_init ( void )
{
    log_cfg_t log_cfg;
    lem_cfg_t cfg;

    /** 
     * Logger initialization.
     * Default baud rate: 115200
     * Default log level: LOG_LEVEL_DEBUG
     * @note If USB_UART_RX and USB_UART_TX 
     * are defined as HAL_PIN_NC, you will 
     * need to define them manually for log to work. 
     * See @b LOG_MAP_USB_UART macro definition for detailed explanation.
     */
    LOG_MAP_USB_UART( log_cfg );
    log_init( &logger, &log_cfg );
    log_info( &logger, "---- Application Init ----" );

    //  Click initialization.

    lem_cfg_setup( &cfg );
    LEM_MAP_MIKROBUS( cfg, MIKROBUS_1 );
    lem_init( &lem, &cfg );
    log_printf( &logger, "---------------------\r\n" );
    log_printf( &logger, "      LEM Click      \r\n" );
    log_printf( &logger, "---------------------\r\n" );
}

Application Task

This is an example that shows the capabilities of the LEM click by measuring current passing through the conductor placed through the hole on the sensor.

void application_task ( void )
{
    current = lem_get_current( &lem, LEM_MILIAMP_COEF );

    log_printf( &logger, " Current : %.2f mA \r\n", current );
    log_printf( &logger, "---------------------\r\n" );
    Delay_ms ( 1000 );
}

The full application code, and ready to use projects can be installed directly form compilers IDE(recommneded) or found on LibStock page or mikroE GitHub accaunt.

Other mikroE Libraries used in the example:

• MikroSDK.Board
• MikroSDK.Log
• Click.Lem

Additional notes and informations

Depending on the development board you are using, you may need USB UART click, USB UART 2 Click or RS232 Click to connect to your PC, for development systems with no UART to USB interface available on the board. The terminal available in all Mikroelektronika compilers, or any other terminal application of your choice, can be used to read the message.